I used to fly alone all the time as a kid. It builds confidence. It’ll be good for him.
Discussion
As long as he trusts his instruments, and is thorough with his pre-flight checks, he will be fine
I grew up outside NYC. I would lie about going to a friend’s house, and take the train to Manhattan. Wandering around Central Park and finding my way around pre-smartphone.
A kid needs to feel what it’s like to be fully responsible for themself, without helicopter parents or overbearing adults around. It’s so important.